/*
 * $Id: HeadWriter.java,v 1.7 2004/09/26 09:15:48 eed3si9n Exp $
 * 
 * $Copyright: copyright (c) 2003, e.e d3si9n $
 * $License: 
 * This source code is part of DoubleType.
 * DoubleType is a graphical typeface designer.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This Program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * In addition, as a special exception, e.e d3si9n gives permission to
 * link the code of this program with any Java Platform that is available
 * to public with free of charge, including but not limited to
 * Sun Microsystem's JAVA(TM) 2 RUNTIME ENVIRONMENT (J2RE),
 * and distribute linked combinations including the two.
 * You must obey the GNU General Public License in all respects for all 
 * of the code used other than Java Platform. If you modify this file, 
 * you may extend this exception to your version of the file, but you are not
 * obligated to do so. If you do not wish to do so, delete this exception
 * statement from your version.
 * $
 */
 
 
package org.doubletype.ossa.truetype;

import java.io.*;
import java.util.*;
import java.awt.*;

/**
 * @author e.e
 */
public class HeadWriter extends FontFormatWriter {
	static public final int k_yZeroIsBaseLine = 0x1; // bit 0
	static public final int k_xLeftMostBlackIsLsb = 0x2; // bit 1
	static public final int k_scaledPointDiffer = 0x4; // bit 2
	static public final int k_useIntegerScaling = 0x8; // bit 3
	
	// used by microsoft
	static public final int k_scaleLinear = 0x10;
	
	// for vertical fonts
	static public final int k_xZeroIsBaseLine = 0x20;
	// 0x40
	static public final int k_linguisticRendering = 0x80;
	static public final int k_defaultMetamorphosis = 0x100;
	static public final int k_rightToLeft = 0x200;
	static public final int k_indicRearrangement = 0x400;
	
		
	private final long k_magicNumber = 0x5f0f3cf5;
	
	private long m_checkSumAdjustment = 0;
	private Point m_min = new Point(0, 0);
	private Point m_max = new Point(0, 0);
	
	public HeadWriter() {
		super();
	}
	
	void setCheckSumAdjustment(long a_value) {
	    m_checkSumAdjustment = a_value;
	}
	
	public Point getMin() {
	    return m_min;
	}
	
	public Point getMax() {
	    return m_max;
	}
	
	public void updateMin(Point a_value) {
	    if (a_value.x < m_min.x) {
	        m_min.x = a_value.x;
	    } // if
	    
	    if (a_value.y < m_min.y) {
	        m_min.y = a_value.y;
	    } // if
	}
	
	public void updateMax(Point a_value) {
	    if (a_value.x > m_max.x) {
	        m_max.x = a_value.x;
	    } // if
	    
	    if (a_value.y > m_max.y) {
	        m_max.y = a_value.y;
	    } // if
	}
	
	public void write() throws IOException {
		// table version number
		writeFixed32(1.0);
		
		// fontRevision
		writeFixed32(1.0);
		
		writeUInt32(m_checkSumAdjustment);
		writeUInt32(k_magicNumber);
		
		// LSB is the distance from 0, 0 to the left of the glyph bounds.
		// flags
		writeUInt16(k_yZeroIsBaseLine
			| k_xLeftMostBlackIsLsb
			| k_scaledPointDiffer);;
		
		// unitsPerEm
		writeUInt16(1024);
		
		// created, modified
		writeLongDateTime(new Date());
		writeLongDateTime(new Date());
		
		writeFWord(m_min.x);
		writeFWord(m_min.y);
		writeFWord(m_max.x);
		writeFWord(m_max.y);
		
		// macStyle
		writeUInt16(0);
		
		// lowestRecPPEM
		writeUInt16(11);
		
		// font direction hint
		// 2, for strongly left to right
		// but also contains neutrals
		writeInt16(2); 
	
		// indexToLocFormat. 1, for long
		writeInt16(1);
		
		// glyfDataFormat
		writeInt16(0);
		pad();
	}
	
	protected String getTag() {
		return "head";
	}
}
